build(deps): bump third_party/picorv32 from `409d0df` to `59ef495`
build(deps): bump third_party/picorv32 from `409d0df` to `59ef495`

Bumps [third_party/picorv32](https://github.com/cliffordwolf/picorv32) from `409d0df` to `59ef495`.
- [Release notes](https://github.com/cliffordwolf/picorv32/releases)
- [Commits](https://github.com/cliffordwolf/picorv32/compare/409d0dfd6772551e2ce77502e368973c447cbeb8...59ef49564f214f5031cf7e6c67290dac6354fb69)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
SymbiFlow/fpga-tool-perf,SymbiFlow/fpga-tool-perf,SymbiFlow/fpga-tool-perf,SymbiFlow/fpga-tool-perf